Hall Kimberly E, Langner Joanna, Segovia Nicole, Schultz Blake, Andriacchi Thomas, Gold Garry, Safran Marc R
Orthopedic Surgery Department, Stanford Hospital and Clinics, 450 Broadway St, Pavilion A, Redwood City, CA, 94063, USA.
Orthopedic Surgery Department, Stanford Hospital and Clinics, 450 Broadway St, Pavilion A, Redwood City, CA, 94063, USA.
J ISAKOS. 2022 Feb;7(1):7-12. doi: 10.1016/j.jisako.2021.10.003. Epub 2021 Nov 17.
Femoroacetabular impingement (FAI) morphology is associated with hip pain and disability. Water polo players utilise the egg beater motion (method of treading water with legs rotating like an "egg beater"), and it is currently unclear what the relationship is between an egg beater and FAI morphology. Our objective was to associate hip range of motion during egg beater motion to MRI findings.
Eight National Collegiate Athletic Association (NCAA) Division 1 varsity water polo athletes (5 females and 3 males) were filmed at orthogonal views performing the egg beater motion using two waterproof cameras in synchrony. A model-based image-matching technique was used to determine hip joint angles which were recorded from the software. These athletes also underwent noncontrast MRI scans of both hips using a 3T MRI scanner and completed an 33-item International Hip Outcome Tool (iHOT-33) hip pain outcomes questionnaire. Descriptive statistics are reported as counts and percentages for categorical variables and as means, standard deviations, and a five-number summary for continuous variables. Relationships between the range of motion measures with MRI measures and with iHOT33 scores were analysed using linear regression models. All statistical analyses were completes using a two-sided level of significance of 0.05.
The average alpha angles for the right and left hips were 71.8 ±7.5 and 74.1 ±8.4, respectively. There was no statistically significant correlation between hip range of motion in any plane and alpha angle or lateral centre edge angle (CEA) on MRI. The average iHOT33 was 85.9 ± 18.9. Participants who had a labral tear had significantly smaller hip abduction ranges than participants who did not have a labral tear (29° ± 4.1 vs. 35.3° ± 0.6, p = 0.02), and those who had a labral tear had significantly increased hip flexion during egg beater kicking as compared with participants who did not have a labral tear (28.2° ± 6.1 vs. 16.3° ± 4, p = 0.02). There were no differences between right and left alpha angles or between right and left CEA.
There were no significant correlations between hip range of motion and alpha angle or CEA, but hips with labral pathology had greater hip flexion and more limited hip abduction ranges.
股骨髋臼撞击症（FAI）形态与髋关节疼痛及功能障碍相关。水球运动员会使用打蛋器动作（双腿像打蛋器一样旋转踩水的方法），目前尚不清楚打蛋器动作与FAI形态之间的关系。我们的目的是将打蛋器动作期间的髋关节活动范围与磁共振成像（MRI）结果相关联。
使用两台防水相机同步从正交视角拍摄8名美国大学体育协会（NCAA）一级大学水球运动员（5名女性和3名男性）进行打蛋器动作的画面。采用基于模型的图像匹配技术确定从软件记录的髋关节角度。这些运动员还使用3T MRI扫描仪对双侧髋关节进行了无造影剂MRI扫描，并完成了一份包含33个项目的国际髋关节结果工具（iHOT-33）髋关节疼痛结果问卷。分类变量的描述性统计以计数和百分比表示，连续变量以均值、标准差和五数概括表示。使用线性回归模型分析运动范围测量值与MRI测量值以及与iHOT33评分之间的关系。所有统计分析均在双侧显著性水平为0.05的情况下完成。
右髋和左髋的平均α角分别为71.8±7.5和74.1±8.4。在任何平面上的髋关节活动范围与MRI上的α角或外侧中心边缘角（CEA）之间均无统计学显著相关性。iHOT33的平均分为85.9±18.9。有盂唇撕裂的参与者的髋关节外展范围明显小于没有盂唇撕裂的参与者（29°±4.1对35.3°±0.6，p = 0.02），并且与没有盂唇撕裂的参与者相比，有盂唇撕裂的参与者在打蛋器踢腿过程中的髋关节屈曲明显增加（28.2°±6.1对16.3°±4，p = 0.02）。左右α角之间或左右CEA之间没有差异。
髋关节活动范围与α角或CEA之间无显著相关性，但有盂唇病变的髋关节有更大的髋关节屈曲和更有限的髋关节外展范围。
